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A square in a square.
Also known as: Class II symbol, Double insulation mark, Appliance class marking
The mark stating how an electrical product protects a user from electric shock.
States the means by which a product protects the user from electric shock.
Contexts: Public information
The nested square means the product does not rely on an earth connection, so an appliance carrying it is safe on a two-pin supply where one relying on earthing would not be — the mark is about what the product does not need.
Contexts: Public information
States a design property and not a test result on the item in hand; nothing here is a means of verifying that a particular product is safe.
The mark states a design class, not the condition of any individual item.
Contexts: Public information
A small square enclosing a second square, marking double insulation, with other classes marked by an earth symbol or by a class numeral.